The number of molecules in 22.4cm3 of nitrogen gas at STP is a) 6.022×10 to the power 20 b) 6.022×10 to the power 23 c) 22.4×10 to the power 20 d) 22.4×10 to the power 23

There are 6.022*10^23 molecules present in 22400cm^3 gas.
Therefore the no. of molecules present in 22.4cm^3=

6.022*10^23 * 22.4cm^3 divide by:
224000 cm^3

Hence we get the ans as 6.022*10^20 molecules.
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